Propontocypris bengalensis Maddocks, 1969

Chitnarin, Anisong, Forel, Marie-Béatrice & Tepnarong, Prachya, 2023, Holocene ostracods (Crustacea) from a whale-fall excavation site from the Chao Phraya delta, Central Thailand, European Journal of Taxonomy 856 (1), pp. 120-151 : 127

Propontocypris bengalensis Maddocks, 1969

Fig. 5D–F

Propontocypris (Schedopontocypris) bengalensis Maddocks, 1969: 34 , fig. 31a, c, f.

Propontocypris bengalensis – Mostafawi 2003: 71, fig. 48a–b. — Wang et al. 2018: 325, fig. 2h–i. Pontocypris sp. A . – Bate 1971: 246, pl. 1 figs 1g, 2g. — Bonaduce et al. 1983: pl. 5 figs 7–8. Propontocypris sp. C . – Paik 1977: 42, pl. 7 fig. 140, pl. 10 fig. 179.

Dimensions

L = 0.467 –0.493 millimeters; H = 0.213 –0.246 millimeters; H/L = 0.44–0.51.

Distribution

Modern distribution: Persian Gulf ( Maddocks 1969; Mostafawi 2003); Bay of Bengal and Sri Lanka ( Maddocks 1969); Persian Gulf ( Bate 1971; Paik 1977); Red Sea ( Bonaduce et al. 1983).

Fossil distribution: Hang Hau Formation, Lei Yue Mun, Hong Kong, Holocene ( Wang et al. 2018); Bangkok Clay (samples 20SS01A, 03A, 04A), whale excavation site, Samut Sakhon Province, Thailand, Late Holocene (this work).

Remarks

Propontocypris bengalensis Maddocks, 1969 is diagnosed by its small compressed carapace, suboval outline, Hmax located anterior to midL, long ABD, round AB with small radius of curvature, straight VB, round PB with large radius of curvature, slight overlapping of LV on LV around the carapace. Carapaces are delicate, usually yellow, white or transparent. The examined specimens are smaller than those from the Holocene of Hong Kong (L = 0.52–0.53 millimeters; H = 0.27–0.28 millimeters) reported by Wang et al. (2018).

Figures

Fig. 5. Holocene ostracods from Samut Sakhon Province, Central Thailand.A–C. Aglaiocypris pellucida Mostafawi, 2003. A. Carapace, right lateral view, SUT-20SS-C003. B. Carapace, left lateral view, SUT-20SS-C007. C. Carapace, left lateral view, SUT-20SS-C003. – D–H. Propontocypris bengalensis Maddocks, 1969. D. Carapace, left lateral view, SUT-20SS-C012. E. Carapace, left lateral view, SUT- 20SS-C020. F. Carapace, left lateral view, SUT-20SS-C014. G. Carapace, right lateral view, SUT- 20SS-C027. H. Carapace, left lateral view, SUT-20SS-C022. – I–O. Sinocytheridea impressa (Brady, 1869). I. Carapace, female, right lateral view, SUT-20SS-C063. J. Carapace, male, right lateral view, SUT-20SS-C040. K. Internal view of right valve, male, SUT-20SS-C049. L. Carapace, female, left lateral view, SUT-20SS-C071. M. Carapace, male, left lateral view, SUT-20SS-C071. N. Internal view of left valve, male, SUT-20SS-C048. O. Internal view of left valve, female, SUT-20SS-C064. Scale bars = 0.1. mm.